http://cer.eu/in-the-press/speech-michel-barnier-future-eu-conference
http://www.wsta.co.uk/images/Brexit/Brexit_FINAL.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmbeis/379/379.pdf
http://www.reuters.com/article/us-britain-eu-verhofstadt-idUSKBN19V0WP